tofsee | edf98c8d92926d258cf70c2348ab4c68d31b377cd273b0686f12e3545089030b

Analysis

max time kernel
145s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
16-05-2024 23:05

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General

Target

20de026bf4998364c894a00f7a97df60.exe
Size

99KB
MD5

20de026bf4998364c894a00f7a97df60
SHA1

9db4857e4894082aa77c5f5b82009f2028f8fc51
SHA256

7f8cb81aabb63a3bb8806b9c055582bec59ef104362316dc164dd686128b9246
SHA512

10894d234217ba24391d5de14e40908cfb13ae367e943b34fafad9c6bd5caa937501f1db04ee43127171d40d7d185fa09cf3de8f765b89aa706272ee6c0596dc
SSDEEP

1536:R33ZAoU8Ed7fzXfQFlj8+6a+Vpvy/eKaO/VChHWNvw0+pDi8P19Exk:hZ3EZf6A+6a+Vpvy/ead22KHDDPEa

Score

10^/10

tofsee evasion execution persistence trojan

Malware Config

Extracted

Family

tofsee

43.231.4.7

lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002
Modifies Windows Firewall 2 TTPs 1 IoCs
evasion

Windows Service
T1543.003

Disable or Modify System Firewall
T1562.004

Processes:

netsh.exe

pid process

3336 netsh.exe

pid	process
3336	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\sgnonvhr\ImagePath = "C:\\Windows\\SysWOW64\\sgnonvhr\\srdzeoyl.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

20de026bf4998364c894a00f7a97df60.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	20de026bf4998364c894a00f7a97df60.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

4888 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

srdzeoyl.exe

pid process

4392 srdzeoyl.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

srdzeoyl.exe

description pid process target process

PID 4392 set thread context of 4888 4392 srdzeoyl.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

4560 sc.exe
2240 sc.exe
3152 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
4888	svchost.exe

pid	process
4392	srdzeoyl.exe

description	pid	process	target process
PID 4392 set thread context of 4888	4392	srdzeoyl.exe	svchost.exe

pid	process
4560	sc.exe
2240	sc.exe
3152	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

20de026bf4998364c894a00f7a97df60.exesrdzeoyl.exe

description	pid	process	target process
PID 1836 wrote to memory of 4764	1836	20de026bf4998364c894a00f7a97df60.exe	cmd.exe
PID 1836 wrote to memory of 4764	1836	20de026bf4998364c894a00f7a97df60.exe	cmd.exe
PID 1836 wrote to memory of 4764	1836	20de026bf4998364c894a00f7a97df60.exe	cmd.exe
PID 1836 wrote to memory of 4968	1836	20de026bf4998364c894a00f7a97df60.exe	cmd.exe
PID 1836 wrote to memory of 4968	1836	20de026bf4998364c894a00f7a97df60.exe	cmd.exe
PID 1836 wrote to memory of 4968	1836	20de026bf4998364c894a00f7a97df60.exe	cmd.exe
PID 1836 wrote to memory of 4560	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 4560	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 4560	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 2240	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 2240	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 2240	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 3152	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 3152	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 3152	1836	20de026bf4998364c894a00f7a97df60.exe	sc.exe
PID 1836 wrote to memory of 3336	1836	20de026bf4998364c894a00f7a97df60.exe	netsh.exe
PID 1836 wrote to memory of 3336	1836	20de026bf4998364c894a00f7a97df60.exe	netsh.exe
PID 1836 wrote to memory of 3336	1836	20de026bf4998364c894a00f7a97df60.exe	netsh.exe
PID 4392 wrote to memory of 4888	4392	srdzeoyl.exe	svchost.exe
PID 4392 wrote to memory of 4888	4392	srdzeoyl.exe	svchost.exe
PID 4392 wrote to memory of 4888	4392	srdzeoyl.exe	svchost.exe
PID 4392 wrote to memory of 4888	4392	srdzeoyl.exe	svchost.exe
PID 4392 wrote to memory of 4888	4392	srdzeoyl.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\20de026bf4998364c894a00f7a97df60.exe
"C:\Users\Admin\AppData\Local\Temp\20de026bf4998364c894a00f7a97df60.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1836
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sgnonvhr\
  2⤵
  PID:4764
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\srdzeoyl.exe" C:\Windows\SysWOW64\sgnonvhr\
  2⤵
  PID:4968
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create sgnonvhr binPath= "C:\Windows\SysWOW64\sgnonvhr\srdzeoyl.exe /d\"C:\Users\Admin\AppData\Local\Temp\20de026bf4998364c894a00f7a97df60.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4560
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description sgnonvhr "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2240
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start sgnonvhr
  2⤵
  - Launches sc.exe
  PID:3152
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  PID:3336

C:\Windows\SysWOW64\sgnonvhr\srdzeoyl.exe
C:\Windows\SysWOW64\sgnonvhr\srdzeoyl.exe /d"C:\Users\Admin\AppData\Local\Temp\20de026bf4998364c894a00f7a97df60.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4392
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4888

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=2268 --field-trial-handle=2244,i,11878111470816612087,2265290141962607370,262144 --variations-seed-version /prefetch:8
1⤵
PID:2276

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\srdzeoyl.exe

Filesize
13.4MB

MD5
9e4b9502294bb39f9252f0deef37a018

SHA1
96846e0bae10932581fb6820c253ed070adadb4a

SHA256
f7fdc5ad2d3b8d697f4af81317103691071bb5f920cbaabc342f2eb7acaa03be

SHA512
a68e0b642de658df569a0675aec84f06b39311673389c925fa593ceaa1ef53b0da68dc3b4fa3ac6562d18485c62a113ac167dcc5dd94576e6184b0f17e62271d

Download Submit
memory/1836-2-0x0000000000590000-0x0000000000591000-memory.dmp

Filesize
4KB

Download
memory/1836-1-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/1836-0-0x0000000000B70000-0x0000000000B71000-memory.dmp

Filesize
4KB

Download
memory/1836-4-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/1836-6-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4392-8-0x0000000000B70000-0x0000000000B71000-memory.dmp

Filesize
4KB

Download
memory/4392-9-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4392-11-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4888-10-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download
memory/4888-13-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download
memory/4888-15-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download
memory/4888-14-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download
memory/4888-16-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download
memory/4888-17-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download